[tei-council] Further purification

[Lou Burnard]

Thinking about pure ODD, it occurs to me that it would be very useful if 
one could treat <classRef>s in the same way as <moduleRef>s -- i.e. by 
adding the attributes @include and @exclude to <classRef> it would be 
possible inside an elementSpec to do things like

(a) <classRef key="att.global" except="att.linking"/>

as a short way of suppressing a bunch of attributes

or

(b) <classRef key="att.linking" include="next prev corresp"/>

as a neat way of saying which attributes I do want.

Similarly, for model classes, it would be really nice to be able to say 
inside a content model something like

(c)  <classRef key="model.choiceLike" except="seg"/>

which would not interfere with seg appearing elsewhere in a content 
model, but would suppress it from inside <choice> in a tidy way.

Anyone object to my adding these two attributes as part of the pure ODD 
work?